CN106841286A - A kind of concrete and cooling water pipe heat transfer experiments method - Google Patents
A kind of concrete and cooling water pipe heat transfer experiments method Download PDFInfo
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- CN106841286A CN106841286A CN201710144428.7A CN201710144428A CN106841286A CN 106841286 A CN106841286 A CN 106841286A CN 201710144428 A CN201710144428 A CN 201710144428A CN 106841286 A CN106841286 A CN 106841286A
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- water pipe
- cooling water
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- concrete
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses a kind of concrete and cooling water pipe heat transfer experiments method.Test principle of the invention is simple, possesses operability, by changing heat flow rate per unit area, changing the heat exchange efficiency that water pipe material obtains concrete test block and cooling water pipe, to be studied by test result analysis, therefrom seek the general rule of the factors such as the coefficient of heat transfer and changes of heat flux, the normal physical property of material, to set up coefficient of heat transfer computation model, understand fully that concrete and cooling water pipe, in the heat exchange behavior of experimental period overall process, key parameter are provided when carrying out simulation study for the application from now on to identical water pipe.
Description
Technical field
The present invention relates to a kind of concrete and cooling water pipe heat transfer experiments method.
Background technology
Concrete is thermal conductive material, and because hydrated cementitious exothermic reaction, temperature constantly rise after pouring, inside reaches as high as
30 DEG C~70 DEG C；It is again simultaneously inert material, and internal heat is scattered and disappeared and is later than surface, forms feelings of the internal temperature higher than surface
Shape.The presence of the excessive basic temperature difference and internal-external temperature difference is easily caused the cracking of concrete, therefore fundamentally prevents concrete
Crack occurs being exactly that wherein water pipe cooling technology is in a kind of effective concrete in time by its internal heat derives
Portion's cool-down method, wherein water pipe cooling efficiency depend on the heat-exchange capacity of water pipe and concrete to a certain extent, generally by changing
Hot coefficient is characterized, while the coefficient is also the key parameter of water pipe cooling concrete numerical simulation, its precision directly determines imitative
The true precision for calculating.But the coefficient of heat transfer still lacks effective research technique to obtain at present still by empirically determined.
The content of the invention
The purpose of the present invention is exactly to solve the above problems, there is provided a kind of concrete and cooling water pipe heat transfer experiments side
Method.
To achieve the above object, the present invention uses following technical scheme：A kind of concrete and cooling water pipe heat transfer experiments side
Method, comprises the following steps：
(1) polygon prism concrete test block is made, the rib number of polygon prism concrete test block is n, and n >=5 are provided with cooling in the middle of test block
Concrete test block is stretched out at water water pipe I, the two ends of cooling water pipe I；
(2) polygon prism concrete test block has n face, and each face is divided into 4 regions, respectively A areas, B areas, C areas along its length
With D areas, thin film heater is provided with corresponding each region in each face；
(3) SMD thermocouple on the inner and outer wall of cooling water pipe I, in polygon prism concrete test block is equipped with, it is SMD
Thermocouple is radiated and is uniformly arranged in a ring along cooling water pipe I, and SMD thermocouple is supported the use with central processing unit；
(4) polygon prism concrete test block and cooling water pipe I are placed in chamber；
(5) by 4 heating states of the thin film heater in region on n face of polygon prism concrete test block and each face carry out with
Machine is combined, and the heating-up temperature of thin film heater is changed in setting range, and the temperature of each point is measured by SMD thermocouple
Value, draws the heat exchange efficiency of each point concrete test block and cooling water pipe I；
(6) polygon prism concrete test block is made, the cooling water water pipes different from the material of cooling water water pipe I is provided with the middle of test block
II, repeat the above steps, draw the heat exchange efficiency of each point concrete test block and cooling water pipe II；
(7) heat exchange efficiency drawn in step (5) and step (6) is carried out into regression analysis, obtains concrete test block and cooling water
The heat exchange efficiency model of pipe.
The outer surface of the polygon prism concrete test block is provided with asbestos layer, and poly- four are provided between asbestos layer and experiment chamber interior wall
PVF interlayer, the two ends outer surface that cooling water pipe I stretches out is provided with polytetrafluoroethylene (PTFE) interlayer, is filled out in remaining space in chamber
Fill fine sand.
The heating-up temperature of the thin film heater is 30 DEG C~70 DEG C.
The cooling water pipe I is iron pipe, and cooling water water pipe II is managed for HDPE.
The chamber is made up of glass mat, and chamber is arranged on support base.
The polygon prism concrete test block is pentagonal prism concrete test block, and pentagonal prism concrete test block has 5 faces, respectively
I face, II face, III face, IV face and V face.
Test principle of the invention is simple, possesses operability, is mixed by changing heat flow rate per unit area, changing water pipe material
The test block of solidifying soil and the heat exchange efficiency of cooling water pipe, to be studied by test result analysis, therefrom seek the coefficient of heat transfer with heat
The general rule of the factors such as the normal physical property of rheology, material, to set up coefficient of heat transfer computation model, understands fully concrete with cooling
Water pipe provides crucial ginseng in the heat exchange behavior of experimental period overall process when carrying out simulation study for the application from now on to identical water pipe
Number.
Brief description of the drawings
Fig. 1 is experimental rig structural representation of the invention.
Fig. 2 is the Section A-A figure of Fig. 1.
Specific embodiment
Concrete and cooling water pipe heat transfer experiments method as shown in Fig. 1~Fig. 2, comprise the following steps：
(1) polygon prism concrete test block 6 is made, the rib number of polygon prism concrete test block 6 is n, and n >=5 are provided with cold in the middle of test block
But water water pipe I 7, concrete test block is stretched out at the two ends of cooling water pipe I 7；
(2) polygon prism concrete test block 6 has n face, and each face is divided into 4 regions, respectively A areas, B areas, C areas along its length
With D areas, thin film heater 5 is provided with corresponding each region in each face, concrete test block is entered by thin film heater 5
Row heating；
(3) SMD thermocouple 1, paster on the inner and outer wall of cooling water pipe I 7, in polygon prism concrete test block 6 are equipped with
Formula thermocouple 1 is radiated and is uniformly arranged in a ring along cooling water pipe I 7, and SMD thermocouple 1 is supported the use with central processing unit,
Can direct measurement liquid and solid temperature, central processing unit can be the computer for being provided with software kit；
(4) polygon prism concrete test block 6 and cooling water pipe I 7 are placed in chamber 8, chamber 8 is by glass mat system
Into can play a part of fixing concrete test block and cooling water pipe and completely cut off the heat exchange of they and external environment condition, test
Case 8 is arranged on support base 2；
(5) 4 heating states of the thin film heater in region 5 on n face of polygon prism concrete test block 6 and each face are carried out
Random combine, the heating-up temperature of thin film heater 5 carried out in the range of 30 DEG C~70 DEG C of setting it is slowly varying up and down, by paster
Formula thermocouple 1 measures the temperature value of each point, draws the heat exchange efficiency of each point concrete test block and cooling water pipe I 7；
(6) polygon prism concrete test block 6 is made, the cooling water water pipes different from the material of cooling water water pipe I is provided with the middle of test block
II, repeat the above steps, draw the heat exchange efficiency of each point concrete test block and cooling water pipe II；
(7) heat exchange efficiency drawn in step (5) and step (6) is carried out into regression analysis, obtains concrete test block and cooling water
The heat exchange efficiency model of pipe.
The outer surface of the polygon prism concrete test block 6 is provided with asbestos layer 4, for insulating, being incubated, asbestos layer 4 with experiment
Polytetrafluoroethylene (PTFE) interlayer 3 is provided between the inwall of case 8, plays a part of insulation, the two ends outer surface that cooling water pipe I 7 stretches out is provided with
Polytetrafluoroethylene (PTFE) interlayer 3, fills fine sand 9 in remaining space in chamber 8, heat-insulated for fixing.
By above-mentioned experiment, can obtain under non-homogeneous heat flow rate per unit area, water pipe tube wall is actually changed with concrete test block
The thermal efficiency, heat exchange efficiency formula is：In formula, hj, i are concrete measuring point j effect downcomers i
The heat exchange efficiency of point；TjIt is concrete measuring point j temperature；Tw,iIt is the water temperature of water pipe i points；Tex,iIt is the outside wall surface temperature of water pipe i points；
K is water pipe thermal conductivity factor；χjIt is measuring point j to pipe outer wall face vertical range, αj,iIt is the method phase corner of measuring point j to water pipe i points.
By heat exchange efficiency formula, the heat exchange efficiency value of above-mentioned different operating modes can be obtained, the heat exchange efficiency that will be drawn return and divided
Analysis, obtains the heat exchange efficiency model of concrete test block and cooling water pipe.
It is by the water pipe transient state exchange capability of heat under thermal equilibrium analysis specific operation and cold according to newton according to test result
But law, calculates the transient state Local Condensing Heat Transfer Coefficients value of water pipe, by analyzing its basic law with changes of heat flux, builds one and examines
Consider the coefficient of heat transfer test model of changes of heat flux, the relational expression is avoided traditional thermal resistance theory, in addition to physical property condition, will be considered simultaneously
In the effect in concrete thermal transient flow field, this thinking is consistent cooling water pipe with the existing discussion conclusion on thermal resistance concept.Examine
Consider the model constructed by single result of the test and lack general, we carry out two groups of unlike material water pipes in combinations thereof work
Experiment under condition, the cooling water pipe I for using is iron pipe, and cooling water water pipe II is managed for HDPE, more general to set up one
Coefficient of heat transfer model, to be studied by test result analysis, therefrom seek the coefficient of heat transfer and changes of heat flux, the normal thing of material
The general rule of the factors such as property, to set up coefficient of heat transfer computation model.
Coefficient of heat transfer test model is incorporated into the coupling analysis of water pipe cooling, concrete temperature field and creep stress field
In program, and water pipe cooling concrete test achievement is finely imitated using the coupling procedure and PSO algorithm back analysis programs
Very, to understand fully the heat exchange behavior of concrete and cooling water pipe in experimental period overall process, and coefficient of heat transfer test model is obtained
The inverting data of relevant parameter, key parameter is provided when carrying out simulation study for the application from now on to identical water pipe.
Embodiment
Polygon prism concrete test block 6 can be pentagonal prism, six prisms or seven prism concrete test blocks, concrete test block each
4 heating states of the thin film heater in region carry out random combine on face；Polygon prism concrete test block 6 is pentagonal prism concrete
During test block, pentagonal prism concrete test block has 5 faces, respectively I face, II face, III face, IV face and V face, the examination of pentagonal prism concrete
4 heating states of the thin film heater in region carry out random combine, the composite condition such as institute of table 1 on 5 faces and each face of block
Show.
The operating condition of test of the iron pipe of table 1 and HDPE pipes
It is attached：√ represents heating in table, × represent and do not heat.
Claims (6)
1. a kind of concrete and cooling water pipe heat transfer experiments method, it is characterised in that：Comprise the following steps：
（1）Polygon prism concrete test block is made, the rib number of polygon prism concrete test block is n, and n >=5 are provided with cooling in the middle of test block
Concrete test block is stretched out at water water pipe I, the two ends of cooling water pipe I；
（2）Polygon prism concrete test block has n face, and each face is divided into 4 regions, respectively A areas, B areas, C areas along its length
With D areas, thin film heater is provided with corresponding each region in each face；
（3）SMD thermocouple is equipped with the inner and outer wall of cooling water pipe I, in polygon prism concrete test block, it is SMD
Thermocouple is radiated and is uniformly arranged in a ring along cooling water pipe I, and SMD thermocouple is supported the use with central processing unit；
（4）Polygon prism concrete test block and cooling water pipe I are placed in chamber；
（5）By 4 heating states of the thin film heater in region on n face of polygon prism concrete test block and each face carry out with
Machine is combined, and the heating-up temperature of thin film heater is changed in setting range, and the temperature of each point is measured by SMD thermocouple
Value, draws the heat exchange efficiency of each point concrete test block and cooling water pipe I；
（6）Polygon prism concrete test block is made, the cooling water water pipes different from the material of cooling water water pipe I are provided with the middle of test block
II, repeat the above steps, draw the heat exchange efficiency of each point concrete test block and cooling water pipe II；
（7）By step（5）And step（6）In the heat exchange efficiency that draws carry out regression analysis, obtain concrete test block and cooling water
The heat exchange efficiency model of pipe.
2. concrete according to claim 1 and cooling water pipe heat transfer experiments method, it is characterised in that：The polygon prism is mixed
The outer surface of solidifying soil test block is provided with asbestos layer, and polytetrafluoroethylene (PTFE) interlayer, cooling water pipe I are provided between asbestos layer and experiment chamber interior wall
The two ends outer surface stretched out is provided with polytetrafluoroethylene (PTFE) interlayer, fills fine sand in chamber in remaining space.
3. concrete according to claim 1 and cooling water pipe heat transfer experiments method, it is characterised in that：The film heating
The heating-up temperature of device is 30 DEG C~70 DEG C.
4. concrete according to claim 1 and cooling water pipe heat transfer experiments method, it is characterised in that：The cooling water pipe
I is iron pipe, and cooling water water pipe II is managed for HDPE.
5. concrete according to claim 1 and cooling water pipe heat transfer experiments method, it is characterised in that：The chamber is
It is made up of glass mat, chamber is arranged on support base.
6. concrete according to claim 1 and cooling water pipe heat transfer experiments method, it is characterised in that：The polygon prism is mixed
The test block of solidifying soil is pentagonal prism concrete test block, and pentagonal prism concrete test block has 5 faces, respectively I face, II face, III face, IV face and
V face.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001251A (en) * | 2018-05-25 | 2018-12-14 | 扬州大学 | A kind of physical method for reducing asphalt skin temperature |
| CN112858371A (en) * | 2021-02-02 | 2021-05-28 | 桂林理工大学 | Indoor building thermal environment experimental box |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0307619B1 (en) * | 1987-08-25 | 1993-02-17 | Nkk Corporation | Method for detecting a state of substance existing in pipe |
| RU2121920C1 (en) * | 1997-04-23 | 1998-11-20 | Виктор Аршакович Кеворков | Concrete product plant |
| JP2003065983A (en) * | 2001-08-21 | 2003-03-05 | Kumagai Gumi Co Ltd | Method for analyzing concrete cooling effect by pipe cooling |
| CN202755365U (en) * | 2012-08-21 | 2013-02-27 | 清华大学 | Mass concrete real time online individuation heat exchange intelligent temperature control system |
| CN103942407A (en) * | 2014-02-17 | 2014-07-23 | 葛洲坝集团试验检测有限公司 | Concrete temperature field simulating calculation method based on pouring block |
| CN104819993A (en) * | 2015-05-18 | 2015-08-05 | 河海大学 | Device and method for testing heat exchange coefficient of cooling water pipe walls |
| CN105424494A (en) * | 2015-09-09 | 2016-03-23 | 中国水利水电科学研究院 | Concrete water cooling overall process testing device and method |
-
2017
- 2017-03-10 CN CN201710144428.7A patent/CN106841286B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0307619B1 (en) * | 1987-08-25 | 1993-02-17 | Nkk Corporation | Method for detecting a state of substance existing in pipe |
| RU2121920C1 (en) * | 1997-04-23 | 1998-11-20 | Виктор Аршакович Кеворков | Concrete product plant |
| JP2003065983A (en) * | 2001-08-21 | 2003-03-05 | Kumagai Gumi Co Ltd | Method for analyzing concrete cooling effect by pipe cooling |
| CN202755365U (en) * | 2012-08-21 | 2013-02-27 | 清华大学 | Mass concrete real time online individuation heat exchange intelligent temperature control system |
| CN103942407A (en) * | 2014-02-17 | 2014-07-23 | 葛洲坝集团试验检测有限公司 | Concrete temperature field simulating calculation method based on pouring block |
| CN104819993A (en) * | 2015-05-18 | 2015-08-05 | 河海大学 | Device and method for testing heat exchange coefficient of cooling water pipe walls |
| CN105424494A (en) * | 2015-09-09 | 2016-03-23 | 中国水利水电科学研究院 | Concrete water cooling overall process testing device and method |
Non-Patent Citations (3)
| Title |
|---|
| 张超等: "大体积混凝土施工期冷却水管埋设形式的优化", 《天津大学学报(自然科学与工程技术版)》 * |
| 王海波等: "基于现场试验的混凝土热学参数反演分析与计算", 《三峡大学学报(自然科学版)》 * |
| 郑晨晖等: "水管冷却等效热交换系数及参数敏感性分析", 《科技信息》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001251A (en) * | 2018-05-25 | 2018-12-14 | 扬州大学 | A kind of physical method for reducing asphalt skin temperature |
| CN112858371A (en) * | 2021-02-02 | 2021-05-28 | 桂林理工大学 | Indoor building thermal environment experimental box |
| CN112858371B (en) * | 2021-02-02 | 2022-06-03 | 桂林理工大学 | Indoor building thermal environment experimental box |
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| CN106841286B (en) | 2019-04-12 |
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